Load Cell Component for Improving Structural Strength of Pile Body after Self-Balanced Testing of Pile Foundation

ABSTRACT

The invention discloses a load cell component for improving the structural strength of a pile body after self-balanced testing of a pile foundation, which comprises a loading unit component, upper displacement rod components fixed on the upper part of the loading unit component, and lower displacement rod components fixed on the lower part of the loading unit component, and further comprises telescopic rod components and a grouting component; there is a plurality of telescopic rod components, the telescopic rod components are fixed to the loading unit component, and the telescopic direction of the telescopic rod components is parallel to the loading direction of the loading unit component; each telescopic rod component comprises an inner rod and an outer sleeve, wherein a part of the inner rod is positioned in the outer sleeve, a slurry cavity is formed between the outer wall of the inner rod positioned in the outer sleeve and the inner wall of the outer sleeve, and the outer sleeve is provided with a slurry inlet; and the grouting component communicates with the slurry inlets, and when in use, slurry is introduced into the slurry cavities through the grouting component.

BACKGROUND OF THE INVENTION 1. Technical Field

The invention relates to a load cell component for improving the structural strength of a pile body after self-balanced testing of a pile foundation, and belongs to the field of construction tools.

2. Description of Related Art

At present, with the popularization of the self-balanced pile foundation static load testing technology, convenience and economical efficiency are increasingly prominent. Meanwhile, new application requirements have emerged, which need the support of relevant technologies. In the related art, an engineering pile body is broken after balanced static load testing. To recover the strength of the pile body after testing, the method is to increase grouting outside a load cell and grouting in a loading cavity of the load cell, so that the compressive strength is high after solidification of slurry, which improves the pressure resistance. However, due to the low tensile strength of the slurry after solidification and the relative sliding of a piston and a cylinder in the load cell, sufficient tensile resistance and horizontal force resistance cannot be generated for the tested engineering pile, resulting in low overall structural strength of the tested engineering pile.

BRIEF SUMMARY OF THE INVENTION

In view of the defects of the prior art, the invention provides a load cell component for improving the structural strength of a pile body after self-balanced testing of a pile foundation.

In order to achieve the above purpose, the invention provides the following technical scheme: a load cell component for improving the structural strength of a pile body after self-balanced testing of a pile foundation comprises a loading unit component, upper displacement rod components fixed on the upper part of the loading unit component, and lower displacement rod components fixed on the lower part of the loading unit component, and further comprises telescopic rod components and a grouting component; there is a plurality of telescopic rod components, the telescopic rod components are fixed to the loading unit component, and the telescopic direction of the telescopic rod components is parallel to the loading direction of the loading unit component; each telescopic rod component comprises an inner rod and an outer sleeve, wherein a part of the inner rod is positioned in the outer sleeve, a slurry cavity is formed between the outer wall of the inner rod positioned in the outer sleeve and the inner wall of the outer sleeve, and the outer sleeve is provided with a slurry inlet; and the grouting component communicates with the slurry inlets, and when in use, slurry is introduced into the slurry cavities through the grouting component.

In use, the inner rods are welded to an upper reinforcement cage of an engineering pile and wound tightly with steel wires, and the outer sleeves are welded to a lower reinforcement cage and wound tightly with steel wires; or the inner rods are welded to the lower reinforcement cage of the engineering pile and wound with steel wires, and the outer sleeves are welded to the upper reinforcement cage and wound with steel wires; during self-balanced testing, grouting is carried out on each loading unit through a preset loading pipe, so that the upper part and the lower part of each loading unit move relatively to drive the upper and lower reinforcement cages to move up and down, a fracture surface is generated on the engineering pile, and meanwhile, the inner rods move relatively in the outer sleeves; after self-balanced testing is completed, grouting is carried out on the outer sleeves through the grouting pipes and the annular grouting channel, and after the slurry in the slurry cavity in each telescopic rod component is solidified, the inner rods and the outer sleeves are fixed, and the upper and lower reinforcement cage structures of the engineering pile are continuously connected, which significantly improves the uplift resistance and horizontal force resistance between the upper reinforcement cage and the lower reinforcement cage, significantly improves the overall structural strength of the foundation pile, and restores or even exceeds the structural strength of the original engineering pile.

Further, the grouting component comprises an annular grouting channel and grouting pipes, the telescopic rod components are all connected with the annular grouting channel, the slurry inlet of each outer sleeve is located in the annular grouting channel, one end of each grouting pipe communicates with the annular grouting channel, and the other end is a slurry inlet.

Further, the loading unit component comprises loading units, an upper inner ring, a lower inner ring, and an upper outer ring; there is a plurality of loading units, and the plurality of loading units are uniformly arranged in a circumferential manner; and the upper inner ring and the lower inner ring are positioned between the plurality of loading units and are arranged with one above the other, the upper inner ring is connected with the upper part of each loading unit through an upper connecting plate, the lower inner ring is connected with the lower part of each loading unit through a lower connecting plate, and the upper outer ring is at the periphery of the plurality of loading units and is fixed to the upper parts of the plurality of loading units at the same time.

Further, the annular grouting channel comprises a lower outer ring fixed on the lower part of each loading unit and a slurry replenishing channel which is annular and has an inner opening, the inner side of the slurry replenishing channel is welded to the outer side wall of the lower outer ring, a channel allowing the flow of slurry is enclosed by the slurry replenishing channel and the lower outer ring, the lower outer ring is at the periphery of the plurality of loading units and is fixed to the lower parts of the plurality of loading units at the same time, the inner rods are fixed on the upper outer ring, and the outer sleeves are fixed on the lower outer ring, which makes the stress on the inner rods and the outer sleeves more uniform.

Further, the load cell component also comprises a lower outer ring, and the lower outer ring is at the periphery of the plurality of loading units and fixed to the lower parts of the plurality of loading units at the same time; the inner rods are fixed to the lower outer ring, and the outer sleeves are fixed to the upper outer ring; the grouting component comprises a grouting channel and grouting pipes communicating with the grouting channel; the slurry inlet on each outer sleeve is arranged at the upper end of the outer sleeve; and the grouting channel is a hollow pipe, and through holes corresponding to the slurry inlets are formed on the grouting channel.

Further, both the inner wall of each outer sleeve and the outer wall of each inner rod located inside the corresponding outer sleeve are provided with groove structures, and the arrangement of the groove structures can increase the structural strength between the inner rods and the outer sleeves after grouting.

Further, only a through hole matched with the diameter of the inner rod is left at the upper end of each outer sleeve, the bottom of each inner rod is provided with a limiting table for preventing the inner rod from separating from the corresponding outer sleeve, and the arrangement of the limiting table can increase the structural strength between the inner rods and the outer sleeves after grouting.

Further, the inner rods are fixed to the upper part of the loading unit component, and the outer sleeves are fixed to the lower part of the loading unit component; the grouting component comprises a grouting channel and grouting pipes communicating with the grouting channel; the slurry inlet on each outer sleeve is arranged on the side wall of the outer sleeve; and the grouting channel is a hollow pipe, the grouting channel is welded to the outer sleeves, and through holes corresponding to the slurry inlets are formed on the grouting channel.

Further, there are two slurry inlets, the two slurry inlets are arranged with one above the other, there are two grouting channels, and the two grouting channels are arranged with one above the other and correspond to the slurry inlets respectively, which further ensures that the outer sleeves are filled with slurry.

Further, the load cell component and reinforcement cages of the engineering pile are fixed in advance before pour-molding of the pile foundation, the number of the telescopic rod components is the same as the number of main bars of the reinforcement cages or meets the requirement of equal section replacement, the inner rods are welded to the main bars of an upper reinforcement cage of the engineering pile and wound tightly with steel wires, and the outer sleeves are welded to the main bars of a lower reinforcement cage and wound tightly with steel wires.

BRIEF DESCRIPTION OF THE SEVERAL VIEWS OF THE DRAWINGS

FIG. 1 is a schematic diagram of one embodiment of a load cell component provided by the invention;

FIG. 2 is a schematic diagram showing the connection between a sheath and a slurry replenishing channel in a lower displacement rod component provided by the invention;

FIG. 3 is a schematic diagram of one embodiment of a telescopic rod component provided by the invention;

FIG. 4 is a sectional view of a load cell structure provided by the invention;

FIG. 5 is an enlarged view of A in FIG. 4;

FIG. 6 is a schematic diagram of another embodiment of the telescopic rod component provided by the invention;

FIG. 7 is a sectional view of the telescopic rod component in the embodiment of FIG. 6.

FIG. 8 is a schematic diagram of another embodiment of the load cell component provided by the invention.

In the drawings: 1. loading unit component; 12. upper outer ring; 13. upper inner ring; 14. lower inner ring; 15. upper connecting plate; 16. lower connecting plate; 2. upper displacement rod component; 3. lower displacement rod component; 31. sheath; 311. grouting port; 4. telescopic rod component; 41. inner rod; 411. groove structure; 412. limiting table; 42. outer sleeve; 421. groove structure; 422. slurry inlet; 43. slurry cavity; 5. grouting channel; 51. lower outer ring; 52. slurry replenishing channel.

DETAILED DESCRIPTION OF THE INVENTION

An embodiment of a load cell component for improving the structural strength of a pile body after self-balanced testing of a pile foundation according to the invention will be further described below with reference to FIGS. 1-7.

Referring to FIGS. 1 and 4, a load cell component for improving the structural strength of a pile body after self-balanced testing of a pile foundation comprises a loading unit component 1, upper displacement rod components 2 welded on the upper part of the loading unit component 1, lower displacement rod components 3 welded on the lower part of the loading unit component 1, telescopic rod components 4 and a grouting component, wherein the upper part of the loading unit component 1 refers to the part which moves upward after the loading unit component 1 is loaded, and the lower part of the loading unit component 1 refers to the part which moves downward after the loading unit component 1 is loaded; and in use, the upper displacement rod components 2 and the lower displacement rod components 3 are used for measuring the displacement of the upper part and the lower part of the loading unit component 1 respectively.

The loading unit component 1 comprises loading units 11, an upper inner ring 13, a lower inner ring 14, and an upper outer ring 12.

A plurality of loading units 11 can be arranged according to actual conditions and are uniformly arranged in a circumferential manner. In the present embodiment, it is preferred that there are five loading units 11 which are uniformly arranged in a circumferential manner. The loading unit 11 belongs to the prior art, so the specific structure thereof will not be described in detail in the present embodiment.

The upper inner ring 13 and the lower inner ring 14 are positioned between the plurality of loading units 11 and are arranged with one above the other, the upper inner ring 13 is connected with the upper part of each loading unit 11 through an upper connecting plate 15, and the upper part of each loading unit, the upper connecting plate and the upper inner ring 13 are welded together; the lower inner ring 14 is connected with the lower part of each loading unit 11 through a lower connecting plate 16, and the lower part of each loading unit 11, the lower connecting plate and the lower inner ring 14 are welded together; and the upper part and the lower part of each loading unit 11 are differentiated by an opening surface, the upper part moves upward and the lower part moves downward.

The upper outer ring 12 is positioned at the periphery of the plurality of loading units and is welded to the upper parts of the plurality of loading units 11 at the same time.

Referring to FIGS. 1, 2, 4 and 5, the grouting component comprises an annular grouting channel 5 and grouting pipes; the annular grouting channel 5 is positioned at the periphery of the plurality of loading units 11 and is welded to the lower parts of the plurality of loading units 11 at the same time; the slurry refers to cement slurry or concrete slurry forming the pile foundation, and in use, the slurry is injected into the grouting channel 5 from the grouting pipes; and the annular grouting channel 5 comprises a lower outer ring 51 and a slurry replenishing channel 52 which is annular and has an inner opening, the lower outer ring 51 is welded to the inner opening of the slurry replenishing channel 52, the inner wall of the lower outer ring 51 is welded to the loading unit component 1, and a channel allowing the flow of slurry is enclosed by the lower outer ring 51 and the slurry replenishing channel 52.

In another embodiment, the lower outer ring 51 is at the periphery of the plurality of loading units 11 and is fixed to the lower parts of the plurality of loading units 11 at the same time, the grouting component comprises an annular grouting channel 5 and grouting pipes, the annular grouting channel is a hollow pipe, and the annular grouting channel 5 is not connected to the loading unit component 1.

Referring to FIGS. 1, 2, 3, 6 and 7, there is a plurality of telescopic rod components 4, each telescopic rod component 4 comprises an inner rod 41 and an outer sleeve 42, a part of the inner rod 41 is positioned in the outer sleeve 42, a slurry cavity 43 is formed between the outer wall of the inner rod 41 positioned in the outer sleeve 42 and the inner wall of the outer sleeve 42, and the outer sleeve 42 is provided with a slurry inlet 422; the plurality of telescopic rod components 4 are all connected with the annular grouting channel 5, the telescopic direction of the telescopic rod components 4 is parallel to the loading direction of the loading unit component 1, and the slurry inlet 422 of each outer sleeve 42 is located in the annular grouting channel 5; and one end of each grouting pipe is connected with the annular grouting channel 5, and the other end is a slurry inlet for grouting each slurry cavity 43.

The inner rods 41 are fixed on the upper part of the loading unit component 1, and the outer sleeves 42 are fixed on the lower parts of the loading units 11; or the inner rods 41 are fixed to the upper outer ring 12 and the outer sleeves are fixed to the lower outer ring 51; or as shown in FIG. 8, the inner rods 41 are fixed to the lower outer ring 51 and the outer sleeves 42 are fixed to the upper outer ring 12.

In one embodiment, referring to FIGS. 2, 3 and 8, each slurry inlet 422 is arranged at the top end of the corresponding outer sleeve 42, the top end of each outer sleeve 42 is welded on the grouting channel 5, and the bottom wall of the grouting channel 5 is provided with through holes matched with the slurry inlets 422.

In another embodiment, referring to FIGS. 6 and 7, each slurry inlet 422 is arranged on the side wall of the corresponding outer sleeve 42, the outer sleeves 42 are welded on the side wall of the grouting channel 5, and the grouting channel 5 is provided with through holes corresponding to the slurry inlets 422; and when each slurry inlet 422 is arranged on the side wall of the corresponding outer sleeve 42, there may be a plurality of slurry inlets 422, and accordingly a plurality of grouting channels 5 may be provided corresponding to the slurry inlets 422.

During the on-site installation of an engineering pile, the inner rods 41 are welded to an upper reinforcement cage of the engineering pile and wound tightly with steel wires, and the outer sleeves 42 are welded to a lower reinforcement cage and wound tightly with steel wires; or the inner rods 41 are welded to the lower reinforcement cage of the engineering pile and wound with steel wires, and the outer sleeves 42 are welded to the upper reinforcement cage and wound with steel wires; during self-balanced testing, grouting is carried out on each loading unit 11 through a preset loading pipe, which refers to injecting hydraulic oil herein, so that the upper part and the lower part of each loading unit move relatively to drive the upper and lower reinforcement cages to move up and down till a fracture surface is generated on the engineering pile, and then self-balanced testing is completed; in this process, the inner rods 41 move relatively in the outer sleeves 42; after testing is completed, grouting is carried out on the outer sleeves 42 through the grouting pipes and the annular grouting channel 5, and after the slurry in the slurry cavity 43 in each telescopic rod component 4 is solidified, the inner rods 41 and the outer sleeves 42 are fixed; and at this point, the upper and lower reinforcement cage structures of the engineering pile are continuously connected, which significantly improves the uplift resistance and horizontal force resistance between the upper reinforcement cage and the lower reinforcement cage, significantly improves the overall structural strength of the foundation pile, and restores or even exceeds the structural strength of the original engineering pile.

The number of the telescopic rod components 4 is determined according to the rule that the number of the telescopic rod components 4 is the same as the number of main bars of the reinforcement cage or meets the requirement of equal section replacement, so that stable connection strength of the upper reinforcement cage and the lower reinforcement cage can be realized through the telescopic rod components 4.

Referring to FIGS. 6 and 7, during installation, only a through hole with the size of the diameter of the inner rod 41 is left at the upper end of the outer sleeve 42 for axial movement of the inner rod 41, which allows slurry to be left in the slurry cavity 43.

Referring to FIG. 2, the grouting pipes are sheaths 31 in the lower displacement rod components 3, i.e. the lower end of the sheath 31 in each lower displacement rod component 3 is welded on the annular grouting channel 5 and communicates with the annular grouting channel 5, the side wall of the lower end of each sheath 31 is provided with a grouting port 311, and the upper end extends to the ground or is connected to the ground through a connecting pipe. The arrangement can simplify the grouting structure, facilitate operation, omit corresponding pipes and save cost.

Alternatively, the grouting pipe is an engineering pipe body, one end of the pipe body is in butt joint with an interface on the annular grouting channel 5 through a joint, and the other end is a free end; and during installation, the free end is positioned on the ground, and slurry enters the slurry cavity through the pipe body and the annular grouting channel in sequence during grouting.

Referring to FIG. 3, both the inner wall of each outer sleeve 42 and the outer wall of each inner rod 41 located inside the corresponding outer sleeve 42 are provided with groove structures 411 and 421, and the groove structures are threaded grooves. With this arrangement, when the slurry in the slurry cavities 43 is solidified, the screw grooves 411 and 421 can improve the bonding strength between the inner rods 41 and the outer sleeves 42, which further improves the anti-uplift strength.

Alternatively, referring to FIGS. 6 and 7, the bottom end of each inner rod is provided with a limiting table 412 for preventing the inner rod 41 from separating from the corresponding outer sleeve 42, a gap is formed between the side face of the limiting table 412 and the outer sleeve 42 to facilitate the circulation of the slurry in the outer sleeve, and only a through hole allowing the inner rod 41 to pass through is left at one end of the outer sleeve 42.

Unless otherwise specified, in the invention, if the azimuthal or positional relationship indicated by the terms “width”, “upper”, “lower”, “front”, “rear”, “left”, “right”, “vertical”, “horizontal”, “top”, “bottom”, “inner”, “outer”, “clockwise”, “counterclockwise”, “axial”, “radial” and “circumferential” are based on the azimuthal or positional relationship shown in the drawings, they are only to facilitate and simplify the description of the invention, rather than indicating or implying that the mentioned device or element must have a specific orientation, be constructed or operate in a specific orientation. Therefore, the terms describing the azimuthal or positional relationship in the invention are for illustrative purposes only and should not be construed as limiting the present patent. For those of ordinary skill in the art, the specific meaning of the above terms can be understood in conjunction with the drawings and according to the specific circumstances.

Unless otherwise specified or defined, the terms “arrange” and “connect” in the invention should be understood broadly, for example, they can be fixed connection, detachable connection or integrated connection; can be direct connection, indirect connection through an intermediate medium, or internal communication of two components. For those of ordinary skill in the art, the specific meaning of the above terms in the invention can be understood in specific situations.

The above are only preferred embodiments of the invention, and the scope of protection of the invention is not limited to the above embodiments, but all technical schemes within the concept of the invention fall within the scope of protection of the invention. It should be noted that several improvements or embellishments made by those of ordinary skill in the art without departing from the principles of the invention should also be regarded as the scope of protection of the invention. 

What is claimed is:
 1. A load cell component for improving the structural strength of a pile body after self-balanced testing of a pile foundation, comprising a loading unit component, upper displacement rod components fixed on the upper part of the loading unit component, and lower displacement rod components fixed on the lower part of the loading unit component, characterized in that the load cell component further comprises telescopic rod components and a grouting component; there is a plurality of telescopic rod components, the telescopic rod components are fixed to the loading unit component, and the telescopic direction of the telescopic rod components is parallel to the loading direction of the loading unit component; each telescopic rod component comprises an inner rod and an outer sleeve, wherein a part of the inner rod is positioned in the outer sleeve, a slurry cavity is formed between the outer wall of the inner rod positioned in the outer sleeve and the inner wall of the outer sleeve, and the outer sleeve is provided with a slurry inlet; and the grouting component communicates with the slurry inlets, and when in use, slurry is introduced into the slurry cavities through the grouting component.
 2. The load cell component for improving the structural strength of the pile body after self-balanced testing of the pile foundation according to claim 1, characterized in that the grouting component comprises an annular grouting channel and grouting pipes, the telescopic rod components are all connected with the annular grouting channel, the slurry inlet of each outer sleeve is located in the annular grouting channel, one end of each grouting pipe communicates with the annular grouting channel, and the other end is a slurry inlet.
 3. The load cell component for improving the structural strength of the pile body after self-balanced testing of the pile foundation according to claim 2, characterized in that the loading unit component comprises loading units, an upper inner ring, a lower inner ring, and an upper outer ring; there is a plurality of loading units, and the plurality of loading units are uniformly arranged in a circumferential manner; and the upper inner ring and the lower inner ring are positioned between the plurality of loading units and are arranged with one above the other, the upper inner ring is connected with the upper part of each loading unit through an upper connecting plate, the lower inner ring is connected with the lower part of each loading unit through a lower connecting plate, and the upper outer ring is at the periphery of the plurality of loading units and is fixed to the upper parts of the plurality of loading units at the same time.
 4. The load cell component for improving the structural strength of the pile body after self-balanced testing of the pile foundation according to claim 3, characterized in that the annular grouting channel comprises a lower outer ring fixed on the lower part of each loading unit and a slurry replenishing channel which is annular and has an inner opening, the inner side of the slurry replenishing channel is welded to the outer side wall of the lower outer ring, a channel allowing the flow of slurry is enclosed by the slurry replenishing channel and the lower outer ring, the lower outer ring is at the periphery of the plurality of loading units and is fixed to the lower parts of the plurality of loading units at the same time, the inner rods are fixed on the upper outer ring, and the outer sleeves are fixed on the lower outer ring.
 5. The load cell component for improving the structural strength of the pile body after self-balanced testing of the pile foundation according to claim 3, characterized by further comprising a lower outer ring, wherein the lower outer ring is at the periphery of the plurality of loading units and fixed to the lower parts of the plurality of loading units at the same time; the inner rods are fixed to the lower outer ring, and the outer sleeves are fixed to the upper outer ring; the grouting component comprises a grouting channel and grouting pipes communicating with the grouting channel; the slurry inlet on each outer sleeve is arranged at the upper end of the outer sleeve; and the grouting channel is a hollow pipe, and through holes corresponding to the slurry inlets are formed on the grouting channel.
 6. The load cell component for improving the structural strength of the pile body after self-balanced testing of the pile foundation according to claim 1, characterized in that both the inner wall of each outer sleeve and the outer wall of each inner rod located inside the corresponding outer sleeve are provided with groove structures.
 7. The load cell component for improving the structural strength of the pile body after self-balanced testing of the pile foundation according to claim 1, characterized in that only a through hole matched with the diameter of the inner rod is left at the upper end of each outer sleeve, and the bottom of each inner rod is provided with a limiting table for preventing the inner rod from separating from the corresponding outer sleeve.
 8. The load cell component for improving the structural strength of the pile body after self-balanced testing of the pile foundation according to claim 1, characterized in that the inner rods are fixed to the upper part of the loading unit component, and the outer sleeves are fixed to the lower part of the loading unit component; the grouting component comprises a grouting channel and grouting pipes communicating with the grouting channel; the slurry inlet on each outer sleeve is arranged on the side wall of the outer sleeve; and the grouting channel is a hollow pipe, the grouting channel is welded to the outer sleeves, and through holes corresponding to the slurry inlets are formed on the grouting channel.
 9. The load cell component for improving the structural strength of the pile body after self-balanced testing of the pile foundation according to claim 8, characterized in that there are two slurry inlets, the two slurry inlets are arranged with one above the other, there are two grouting channels, and the two grouting channels are arranged with one above the other and correspond to the slurry inlets respectively.
 10. The load cell component for improving the structural strength of the pile body after self-balanced testing of the pile foundation according to claim 9, characterized in that the load cell component and reinforcement cages of an engineering pile are fixed in advance before pour-molding of the pile foundation, the number of the telescopic rod components is the same as the number of main bars of the reinforcement cages or meets the requirement of equal section replacement, the inner rods are welded to the main bars of an upper reinforcement cage of the engineering pile and wound tightly with steel wires, and the outer sleeves are welded to the main bars of a lower reinforcement cage and wound tightly with steel wires. 